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Atoms: Avogadro's Number
Related Topics
Wize University Chemistry Textbook > Stoichiometry
Atoms, Molecules, and the Mole!
4 Activities
How many
C
\text{C}
C
atoms are there in 260 g of
H
2
CO
3
\text{H}_2\text{CO}_3
H
2
CO
3
?
1.6x10
23
atoms
2.5x10
24
atoms
1.2x10
24
atoms
2.5x10
25
atoms
I don't know
Check Submission
More Atoms, Molecules, and the Mole! Questions:
Combustion, Stoichiometry
What mass of KClO
3
is required to produce proper amount of O
2
needed to achieve complete combustion of 78.88 g CH
4
?
2 KClO
3
→ 2 KCl + 3 O
2
Given that the molar mass of X is 170.12 g mol
-1
, how many molecules of X are present in a tablet that contains 100 mg of X?
Calculate the molar mass of H
2
O
Chemical reactions: Limiting Reagent & Percent Yield
Iron oxidizes when exposed to oxygen to form iron oxide according to the following equation:
Fe (s) + O
2
(g) → Fe
2
O
3
(s)
352g of pure iron is exposed to 12.0 mols of O
2
, and after a period of time, 46.7 g of iron oxide (rust) is collected.
Molecules: Molar mass
Calculate the number of moles of each compound:
a. 18.5 g of MgCO
3
b. 2.36 g of NF
3
Stoichiometry: Chemical formula
How many carbon atoms are in 10.00 mL of ethanol ( CH
3
CH
2
OH)?
The density of ethanol is 0.789 g/mL.
Practice: Finding the Number of Moles of Iron
Calculate the number of moles of Iron atoms in 14.1 g of iron oxide, Fe
2
O
3
Introduction to General Chemistry
Answer the following questions concerning benzoic acid (C
7
H
6
O
2
).
a)
Calculate the number of moles in a 7.50 x 10
-2
g sample of benzoic acid.
b)
Calculate the number of molecules of benzoic acid in the 7.50 x 10
-2
g sample.
Stoichiometry: Moles, atomic mass
Acetominophen (C
8
H
9
NO
2
) is a common drug used to treat pain and fever. It is the main component of common trade names such as Tylenol.
a)
Calculate the molar mass of acetominophen.
b)
How many moles of acetominophen are there in 250.0 g of this compound?
Converting Mass to Number of Atoms
Calculate the number of nitrogen atoms in 2.25 g of bismuth(III) nitrate. (Enter your answer in scientific notation in nitrogen atoms, for example
1.23
⋅
10
18
1.23\cdot10^{18}
1.23
⋅
1
0
18
)
How many grams of oxygen are in 22 mL of water? Remember that the density of water is 1.0 g/mL
How many moles of ammonia (NH
3
) are in 2.4g of ammonia?
Chemical formula: Moles
Which of the following quantities is not equivalent to 5 mg of sodium bicarbonate,NaHCO
3
?
Stoichiometry: Finding the Number of Moles of Iron
Calculate the number of moles of iron atoms in 14.1 g of iron oxide, Fe
2
O
3
Stoichiometry: Molar mass and Avogadro's Number
How many hydrogen atoms are in exactly 2 g of hydrazinium sulfate, N
2
H
6
SO
4
?